Return multiple columns from pandas apply()

Question

I have a pandas DataFrame, df_test. It contains a column \'size\' which represents size in bytes. I\'ve calculated KB, MB, and GB using the following code:

Answer 1

It gives a new dataframe with two columns from the original one.

import pandas as pd
df = ...
df_with_two_columns = df.apply(lambda row:pd.Series([row['column_1'], row['column_2']], index=['column_1', 'column_2']),axis = 1)